The CYBEX Sirona S is the ONLY Convertible car seat to feature a 360 rotatable seat with load leg stability, linear side impact protection and SensorSafe technology. The CYBEX Sirona S is the first Convertible Car Seat in North America to feature an innovative 360° rotatable seat with a load leg, making switching between rear-facing and forward-facing positions quick and easy. The Sirona S load leg stabilizes the seat and can significantly reduce crash forces. These features, combined with an EasyLock™ bar for quick, simple and secure installation, offer advanced safety protection for children — and greater peace of mind for parents. With SensorSafe™ technology, you'll gain instant insight into your child's well-being—right to the SensorSafe app on your phone. Built into the chest clip of CYBEX car seats, SensorSafe provides alerts when unsafe situations arise including if a child unbuckles themselves; if the back seat has become too warm or too cold, if a child has been seated for too long, and if the driver accidentally leaves the child behind. Features: -Innovative, one-hand 360° rotatable seat allows parents to easily get their child in and out -Load leg stabilizes the car seat and can reduce rotation in certain crashes by up to 30% -Only Convertible Car Seat in North America with a one-time vehicle belt installation for both rear-facing and forward-facing mode -EasyLock™ bar reduces force needed up to 4x for quick, simple and secure installation -SensorSafe technology uses a Bluetooth enabled chest clip to send mobile app alerts when potential unsafe situations arise -12-position recline adjustment even while seat is in use -Linear Side-impact Protection absorbs up to 25% more impact in a collision* -Anti-rebound design reduces car seat rebound movement -Magnetic buckle holders make entry and exit from the seat a breeze -Dishwasher safe cup holder can be positioned on either side of seat -12-position, height-adjustable headrest with no-rethread harness -Dual-level indicators help ensure the proper car seat angle -Steel reinforced frame provides strength and durability -Harness pads and 3-position padded buckle provide extra comfort -Removable newborn insert provides support for small babies -Innovative one-pull LATCH removal system -LATCH Connection storage inside the base when not in use -Rear-facing from 4 lbs. to 50 lbs. Forward-facing from 22 lbs. to 65 lbs. *when compared to the same car seat without L.S.P. extended Size: 26.7”D x 20”W x 25.5”H Weight: 32 lbs. Use from Birth up to 65 lbs. or 49 inches, following the directions in your user manual